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20 Cards in this Set
- Front
- Back
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Rotation |
the spinning of a celestial body, such as a planet, around an axis
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revolution |
the orbiting of an object around another object |
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Asis |
an imaginary line around which an object spins or revolves; also one of a number of lines used for determining coordinates |
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latitude |
angular distance north and south of the equator |
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Orbit |
the circular path of an object as it revolves around another object Key |
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Gravity |
an attractive force present between any two masses |
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equator |
an imaginary line that divides Earth into Northern and Southern Hemispheres; located halfway between the North and South Poles (related word: equatorial) |
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Phase |
the apparent shape of the lighted part of the moon that can be seen from Earth |
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Eclipse |
an event that happens when the shadow of an object in space falls on the surface of another object |
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Solar Eclipse |
the temporary blockage of sunlight by the Moon as it travels between Earth and the Sun |
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Telescope |
an instrument used to observe objects that are far away |
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Solar System |
a system of objects that revolve around a star such as the Sun |
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Theory |
a set of statements or principles devised to explain a group of facts or phenomena, especially one that has been repeatedly tested or is widely accepted and can be used to make predictions about natural phenomena. |
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Star |
a massive ball of gas in outer space that gives off heat, light and other forms of radiation |
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Space |
the large, empty part of the universe that does not contain any matter |
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Asteroid |
a small object made of rock or metal that orbits the sun |
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Comet |
a body of ice and dust that travels in a long, narrow orbit around the Sun |
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Hydrogen |
the chemical element consisting of one proton and one electron |
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Solar Energy |
energy that comes from the sun |
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Fusion |
energy that comes from the sun |
